Children's games in street and playground

"In the present study we are concerned solely with the games that children, aged about 6-12, play of their own accord when out of doors, and usually out of sight. We do not include, except incidentally, party games, scout games, team games, or any sport that requires supervision; and we concentrate for the most part on the rough-and-tumble games which, though they may require energy and sometimes fortitude, do not need even the elementary equipment of bat and ball."--Preface.